Improved saw-set



UNITED STATES PATENT OEEICE.

ELIJAl-I S. HOLKI'NS, OF PAINESVILLE, OHIO.

IMPROVED SAW-SET.

Specification forming part of Letters Patent N o. 8,026, dated April8,1851.

To a/ZZ whom it may concern:

Be it known that I, ELIJAH S. HOLKINS, of Painesville, in the county ofLake and State of Ohio, have invented a new and useful Improvement inSaw-Sets for Setting the Teeth of Saws; and I do hereby declare thefollowing is a full, clear, and exact description ot` the same,reference being hadto the annexed drawings, which form part of thisspecification, and in which Y Figure l is a view in perspective of myimproved saw-set, and Figs. 2 and 3 side elevations of the same indetail.

The same letters refer to similar parts in all the iigures.

In my improved saw-set the body of the iinprovement is so constructed asto contain a spring or elastic property in itself-that is to say, in thesame piece ot' metal of which it is composed independent of anyadditional part. The said form, in connection with an adjustable stirrupoperating in a slot therein, enables the machine to be readily adaptedto the length and, sometimes, varying thicknesses of the teeth of thesaw, and by the lever-pu rchase, which is combined with the same, theoperator can take a rm" hold of each tooth in quick succession.

In the accompanying drawings, A A A is the body of the machine,constructed of steel and bent somewhat in the form of an ox-bow. The endof the lower jaw is lengthened out, bent downward, and flattened, asshown at B.

VThis lengthened part receives a setting-screw C, which is insertedthrough its under surface near its end. G is a stirrup, attached to thelower jaw and operating in the slot Dniade through it.

M is a thumb-screw, passing through the the stirrup and slot aforesaid.The upper part of the said stirrup has a feather-edged friction-bearingK, as indicated by the dotted lines in Fig. 2. Said bearing acts on theend of the lever hereinafter mentioned. The end of the upper jaw on itsunder side is cut to a tapering form, as shown at E. rlhe correspondingpart of the lower jaw F is similarly cut, thus forming a pair of lips,for the purpose hereinafter mentioned. H is the lever before referredto. Said lever is connected to the upper part of the stirrup G by thecenter-pin I, on which it works. L is a projecting shoulder, acting as afulcru 1n of the lever aforesaid.

The above-described saw-set is put into operation by first graduatingthe stirrup to the length of the teeth ofthe saw intended to be set bymoving the said stirrup along the slot and making it fast at the desiredpoint by the thumb-screw working therein. The set is then adjusted tothe required angle by elevating or depressing the setting-screw. Themachine being held in the hand of the operator, (the palm resting on theleven) a tooth is inserted between the lips and pressure applied to thelever. This, acting on the upper jaw, closes the lips firmly on thetooth. The machine is then depressed until the point of thesetting-screw comes in contact with the side of the saw-blade whichperforms the operation. The pressure is then relaxed, when the reactionof the spring parts the lips ready for a similar operation.

Having thus described the construction and operation of my improvedsaw-set, what I claim therein as new, and desire to secure by LettersPatent, are the following particulars:

l. Supporting the lever by which motion is given to the jaws by means ofan adjustable stirrup constructed substantially as described, wherebysaid stirrup serves as a gage in addition to performing its ordinaryduties.

2. The arrangement of thejaws constructed of one bent piece of metal,with the lever and stirrup, the handle of said lever projecting backwardtoward the rounded part of the jaw, the whole being constructedsubstantially as herein described.

Y ELIJAH S. HOLKINS.

Witnesses: Y

MILo HARRIS, J. F. SINGLE.

